B1941 airbag control unit fault

What does error code B1941 mean in the airbag control unit?

Error code B1941 indicates a critical interruption in the circuit of the right‑hand airbag crash sensor. Technically, this means an “Open in Selectable Force Limiter Squib Right Circuit” or “Airbag Crash Sensor #1 Feed/Return Circuit Open.” The airbag control unit can no longer properly activate the sensor or read its status, compromising the system’s protective function.

This error code points to a clear electrical issue: an open circuit. The control unit continuously monitors the resistance of ignition circuits and sensors. If an infinitely high resistance is detected—indicating a break in the wiring—the B1941 fault is stored, and the system switches to a safe state.

As a result, the airbag warning light (SRS light) illuminates to alert the driver. In the event of a crash, the proper functioning of the airbag system, especially on the vehicle’s right side, can no longer be guaranteed.

How do you recognize error B1941?

The primary and unmistakable symptom of error B1941 is the permanently illuminated airbag or SRS warning light on the instrument cluster. This light does not turn off after starting the vehicle, signaling an active, safety‑relevant fault in the restraint system.

In some vehicle models, a text message may also appear on the driver information display, indicating a malfunction in the airbag system.

When attempting to read the fault memory with a diagnostic tool, code B1941 is clearly identifiable as the root cause. Using manufacturer‑specific testers such as TECH2 allows for more precise identification of the open wire leading to the right‑hand crash sensor circuit.

What causes B1941?

The main cause of error code B1941 is an open circuit, typically resulting from a broken wire, poor connector contact, or corrosion in the wiring harness connected to the right‑hand airbag crash sensor. Internal defects within the airbag control unit itself, or stored crash data, can also trigger this error.

A common source of failure is damaged cables or corroded connectors. Areas particularly susceptible include those exposed to mechanical stress or moisture, such as cable bundles under seats, behind trim panels, or near the steering wheel’s coil spring.

The airbag control unit itself can also be the culprit. Internal electronic faults—such as conductor tracks damaged by moisture or a short circuit—may cause the unit to falsely report an open circuit.

After a crash, crash data is stored in the control unit, which can lock the system. Even if there are no visible damages, this lockout may lead to error messages like B1941, as the unit is no longer operating normally. Such data can only be erased using specialized equipment.

Which models experience error B1941?

Error code B1941 primarily occurs in various Toyota and Lexus models. Affected series range from older generations, such as the Lexus ES (VCV10) and Toyota Celica (T180), to newer vehicles like the Lexus RX (AL30) or Toyota Corolla (E160).

At Airbag24, we repair error code B1941 for a wide variety of vehicles, including:

Lexus: ES VCV10 (1992–1996), RX AL30 (2022–present), LX VJA300 (2022–present).

Toyota (passenger cars): Corolla E160 (2012–2018), Corolla GR Sport, Auris E150 (2006–2012), Auris E180 (2012–2019), Camry TRD, Century VG40, Celica T180 (1989–1993), Prius I XW10 (1997–2003), Ractis XCP100 (2005–2010), Starlet Cross.

Toyota (SUVs & vans): Sequoia K10 (2000–2007), Prado J90 (1996–2002), Prado J150 (2009–2024), Harrier XU10, Alphard H30 (2015–2023), Vellfire Executive Lounge, Voxy R90, Proace City Verso.

How is error B1941 professionally repaired?

Professional repair of error B1941 focuses on eliminating the physical cause. After sending in the removed airbag control unit, Airbag24 analyzes it at the circuit board level, repairs defective components or traces, and clears any stored crash data.

Before removing the control unit, a precise diagnosis on the vehicle is essential to rule out external sources of failure, such as broken wires. Depending on the model, the control unit is usually located inside the cabin—under the center console, beneath the seats, or behind the glove compartment—and must be removed with the battery disconnected.

Following shipment to Airbag24, electronic restoration takes place. Technicians use precision measurement tools to inspect circuit traces, desolder and replace faulty components, and—if crash data is present—completely erase it using specialized software and hardware, ensuring the control unit regains full functionality.

Finally, the repaired control unit is tested and shipped back. The repair is a cost-effective and sustainable alternative to expensive new purchases and typically does not require reprogramming. All repairs come with 2 years' statutory liability for defects.